btcpayserver/BTCPayServer/Services/Invoices/InvoiceEntity.cs

using NBitcoin;
using System.Linq;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Text;
using BTCPayServer.Models;
using NBitpayClient;
using Newtonsoft.Json.Linq;
using NBitcoin.DataEncoders;
using BTCPayServer.Data;
using NBXplorer.Models;

namespace BTCPayServer.Services.Invoices
{
    public class BuyerInformation
    {
        [JsonProperty(PropertyName = "buyerName")]
        public string BuyerName
        {
            get; set;
        }
        [JsonProperty(PropertyName = "buyerEmail")]
        public string BuyerEmail
        {
            get; set;
        }
        [JsonProperty(PropertyName = "buyerCountry")]
        public string BuyerCountry
        {
            get; set;
        }
        [JsonProperty(PropertyName = "buyerZip")]
        public string BuyerZip
        {
            get; set;
        }
        [JsonProperty(PropertyName = "buyerState")]
        public string BuyerState
        {
            get; set;
        }
        [JsonProperty(PropertyName = "buyerCity")]
        public string BuyerCity
        {
            get; set;
        }
        [JsonProperty(PropertyName = "buyerAddress2")]
        public string BuyerAddress2
        {
            get; set;
        }
        [JsonProperty(PropertyName = "buyerAddress1")]
        public string BuyerAddress1
        {
            get; set;
        }

        [JsonProperty(PropertyName = "buyerPhone")]
        public string BuyerPhone
        {
            get; set;
        }
    }

    public class ProductInformation
    {
        [JsonProperty(PropertyName = "itemDesc")]
        public string ItemDesc
        {
            get; set;
        }
        [JsonProperty(PropertyName = "itemCode")]
        public string ItemCode
        {
            get; set;
        }
        [JsonProperty(PropertyName = "physical")]
        public bool Physical
        {
            get; set;
        }

        [JsonProperty(PropertyName = "price")]
        public double Price
        {
            get; set;
        }

        [JsonProperty(PropertyName = "currency")]
        public string Currency
        {
            get; set;
        }
    }

    public enum SpeedPolicy
    {
        HighSpeed = 0,
        MediumSpeed = 1,
        LowSpeed = 2
    }
    public class InvoiceEntity
    {
        public string Id
        {
            get; set;
        }
        public string StoreId
        {
            get; set;
        }

        public int GetTxCount()
        {
            return Calculate().TxCount;
        }

        public string OrderId
        {
            get; set;
        }

        public Money GetTotalCryptoDue()
        {
            return Calculate().TotalDue;
        }

        private (Money TotalDue, Money Paid, int TxCount) Calculate()
        {
            var totalDue = Money.Coins((decimal)(ProductInformation.Price / Rate)) + TxFee;
            var paid = Money.Zero;
            int txCount = 1;
            var payments =
                Payments
                .Where(p => p.Accounted)
                .OrderByDescending(p => p.ReceivedTime)
                .Select(_ =>
                {
                    paid += _.Output.Value;
                    return _;
                })
                .TakeWhile(_ =>
                {
                    var paidEnough = totalDue <= paid;
                    if (!paidEnough)
                    {
                        txCount++;
                        totalDue += TxFee;
                    }
                    return !paidEnough;
                })
                .ToArray();
            return (totalDue, paid, txCount);
        }

        public Money GetTotalPaid()
        {
            return Calculate().Paid;
        }
        public Money GetCryptoDue()
        {
            var o = Calculate();
            var v = o.TotalDue - o.Paid;
            return v < Money.Zero ? Money.Zero : v;
        }

        public SpeedPolicy SpeedPolicy
        {
            get; set;
        }
        public double Rate
        {
            get; set;
        }
        public DateTimeOffset InvoiceTime
        {
            get; set;
        }
        public DateTimeOffset ExpirationTime
        {
            get; set;
        }
        public BitcoinAddress DepositAddress
        {
            get; set;
        }
        public ProductInformation ProductInformation
        {
            get; set;
        }
        public BuyerInformation BuyerInformation
        {
            get; set;
        }
        public string PosData
        {
            get;
            set;
        }
        public string DerivationStrategy
        {
            get;
            set;
        }
        public string Status
        {
            get;
            set;
        }
        public string ExceptionStatus
        {
            get; set;
        }
        public List<PaymentEntity> Payments
        {
            get; set;
        }
        public bool Refundable
        {
            get;
            set;
        }
        public string RefundMail
        {
            get;
            set;
        }
        public string RedirectURL
        {
            get;
            set;
        }
        public Money TxFee
        {
            get;
            set;
        }
        public bool FullNotifications
        {
            get;
            set;
        }
        public string NotificationURL
        {
            get;
            set;
        }
        public string ServerUrl
        {
            get;
            set;
        }
        public DateTimeOffset? MonitoringExpiration
        {
            get;
            set;
        }
        public HistoricalAddressInvoiceData[] HistoricalAddresses
        {
            get;
            set;
        }

        public HashSet<string> AvailableAddressHashes
        {
            get;
            set;
        }

        public bool IsExpired()
        {
            return DateTimeOffset.UtcNow > ExpirationTime;
        }


        public InvoiceResponse EntityToDTO()
        {
            ServerUrl = ServerUrl ?? "";
            InvoiceResponse dto = new InvoiceResponse
            {
                Id = Id,
                OrderId = OrderId,
                PosData = PosData,
                CurrentTime = DateTimeOffset.UtcNow,
                InvoiceTime = InvoiceTime,
                ExpirationTime = ExpirationTime,
                BTCPrice = Money.Coins((decimal)(1.0 / Rate)).ToString(),
                Status = Status,
                Url = ServerUrl.WithTrailingSlash() + "invoice?id=" + Id,
                Currency = ProductInformation.Currency,
                Flags = new Flags() { Refundable = Refundable }
            };
            Populate(ProductInformation, dto);
            Populate(BuyerInformation, dto);
            dto.ExRates = new Dictionary<string, double>
            {
                { ProductInformation.Currency, Rate }
            };
            dto.PaymentUrls = new InvoicePaymentUrls()
            {
                BIP72 = $"bitcoin:{DepositAddress}?amount={GetCryptoDue()}&r={ServerUrl.WithTrailingSlash() + ($"i/{Id}")}",
                BIP72b = $"bitcoin:?r={ServerUrl.WithTrailingSlash() + ($"i/{Id}")}",
                BIP73 = ServerUrl.WithTrailingSlash() + ($"i/{Id}"),
                BIP21 = $"bitcoin:{DepositAddress}?amount={GetCryptoDue()}",
            };
            dto.BitcoinAddress = DepositAddress.ToString();
            dto.Token = Encoders.Base58.EncodeData(RandomUtils.GetBytes(16)); //No idea what it is useful for
            dto.Guid = Guid.NewGuid().ToString();

            var paid = Payments.Where(p => p.Accounted).Select(p => p.Output.Value).Sum();
            dto.BTCPaid = paid.ToString();
            dto.BTCDue = GetCryptoDue().ToString();

            dto.ExceptionStatus = ExceptionStatus == null ? new JValue(false) : new JValue(ExceptionStatus);
            return dto;
        }

        private void Populate<TFrom, TDest>(TFrom from, TDest dest)
        {
            var str = JsonConvert.SerializeObject(from);
            JsonConvert.PopulateObject(str, dest);
        }

        public Money GetNetworkFee()
        {
            var item = Calculate();
            return TxFee * item.TxCount;
        }
    }

    public class AccountedPaymentEntity
    {
        public int Confirmations
        {
            get;
            set;
        }
        public PaymentEntity Payment { get; set; }
        public Transaction Transaction { get; set; }
    }

    public class PaymentEntity
    {
        public DateTimeOffset ReceivedTime
        {
            get; set;
        }
        public OutPoint Outpoint
        {
            get; set;
        }
        public TxOut Output
        {
            get; set;
        }
        public bool Accounted
        {
            get; set;
        }
    }
}